package com.example.windweatherapp;


import android.app.ProgressDialog;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Toast;

import androidx.fragment.app.Fragment;

import com.example.windweatherapp.databinding.ChooseAreaBinding;
import com.example.windweatherapp.db.City;
import com.example.windweatherapp.db.County;
import com.example.windweatherapp.db.Province;
import com.example.windweatherapp.util.HttpUtil;
import com.example.windweatherapp.util.Utility;

import org.jetbrains.annotations.NotNull;
import org.litepal.LitePal;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.Response;

public class ChooseAreaFragment extends Fragment {

    public static final int LEVEL_PROVINCE = 0;
    public static final int LEVEL_CITY = 1;
    public static final int LEVEL_COUNTY = 2;

    private ProgressDialog progressDialog;

    private ArrayAdapter<String> adapter;
    private List<String> dataList = new ArrayList<>();

    private List<Province> provinceList;

    private List<City> cityList;

    private List<County> countyList;

    private Province selectedProvince;

    private City selectedCity;

    private int currentLevel;

    ChooseAreaBinding binding;
    /**
     * 当前选中的级别
     */
    
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        binding = ChooseAreaBinding.inflate(inflater, container, false);
        adapter = new ArrayAdapter<>(getContext(), android.R.layout.simple_list_item_1,dataList);
        binding.listView.setAdapter(adapter);
        return binding.getRoot();
    }
    @Override
    public void onDestroyView(){
        super.onDestroyView();
        binding=null;
    }
    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        binding.listView.setOnItemClickListener((adapterView, view, position, id) -> {
            if (currentLevel == LEVEL_PROVINCE) {
                selectedProvince = provinceList.get(position);
                queryCities();
            } else if (currentLevel == LEVEL_CITY) {
                selectedCity = cityList.get(position);
                queryCounties();
            }else if (currentLevel == LEVEL_COUNTY){
                String weatherId = countyList.get(position).getWeatherId();
                
                // 通过判断当前Fragment所在的Activity，区分不同的处理方式
                if (getActivity() instanceof MainActivity) {
                    // 在MainActivity中，启动新的WeatherActivity
                    Intent intent = new Intent(getActivity(), WeatherActivity.class);
                    intent.putExtra("current_province", selectedProvince.getProvinceName());
                    intent.putExtra("current_city", selectedCity.getCityName());
                    intent.putExtra("current_county", countyList.get(position).getCountryName());
                    intent.putExtra("weather_id", weatherId);
                    startActivity(intent);
                    getActivity().finish();
                } else if (getActivity() instanceof WeatherActivity) {
                    // 在WeatherActivity中，直接更新天气
                    WeatherActivity activity = (WeatherActivity) getActivity();
                    // 关闭抽屉
                    activity.binding.drawerLayout.closeDrawers();
                    // 显示刷新进度
                    activity.binding.swipeRefresh.setRefreshing(true);
                    // 更新WeatherActivity的城市信息
                    activity.updateCityInfo(
                        selectedProvince.getProvinceName(),
                        selectedCity.getCityName(),
                        countyList.get(position).getCountryName(),
                        weatherId
                    );
                }
            }
        });

        binding.backButton.setOnClickListener(v -> {
            if (currentLevel == LEVEL_COUNTY) {
                queryCities();
            } else if (currentLevel == LEVEL_CITY) {
                queryProvinces();
            }
        });

        queryProvinces();
    }
    /**
     * 查询全国所有的省，优先从数据库查询，如果没有查询到再去服务器去查询
     */
    private void queryProvinces() {
        binding.titleText.setText("中国");
        binding.backButton.setVisibility(View.GONE);

        provinceList = LitePal.findAll(Province.class);
        if (provinceList.size() > 0) {
            dataList.clear();
            for (Province province : provinceList) {
                dataList.add(province.getProvinceName());
            }
            adapter.notifyDataSetChanged();
            binding.listView.setSelection(0);
            currentLevel = LEVEL_PROVINCE;
        } else {
            String address = "http://guolin.tech/api/china";
            queryFromServer(address, "province");
        }
    }
    /**
     * 查询选中省份内的所有市，优先从数据库查询，如果没有查询到再去服务器上查询
     */
    private void queryCities() {
        binding.titleText.setText(selectedProvince.getProvinceName());
        binding.backButton.setVisibility(View.VISIBLE);

        cityList = LitePal.where("provinceid=?", String.valueOf(selectedProvince.getId())).find(City.class);
        if (cityList.size() > 0) {
            dataList.clear();
            for (City city : cityList) {
                dataList.add(city.getCityName());
            }
            adapter.notifyDataSetChanged();
            binding.listView.setSelection(0);
            currentLevel = LEVEL_CITY;
        } else {
            int provinceCode = selectedProvince.getProvinceCode();
            String address = "http://guolin.tech/api/china/" + provinceCode;
            queryFromServer(address, "city");
        }
    }
    /**
     * 查询选中市内所有的县，优先从数据库查询，如果没有查询到再去服务器上查询
     */
    private void queryCounties() {
        binding.titleText.setText(selectedCity.getCityName());
        binding.backButton.setVisibility(View.VISIBLE);

        countyList = LitePal.where("cityid=?", String.valueOf(selectedCity.getId())).find(County.class);
        if (countyList.size() > 0) {
            dataList.clear();
            for (County county : countyList) {
                dataList.add(county.getCountryName());
            }
            adapter.notifyDataSetChanged();
            binding.listView.setSelection(0);
            currentLevel = LEVEL_COUNTY;
        } else {
            int provinceCode = selectedProvince.getProvinceCode();
            int cityCode = selectedCity.getCityCode();
            String address = "http://guolin.tech/api/china/" + provinceCode + "/" + cityCode;
            queryFromServer(address, "county");
        }
    }
    /**
     * 根据传入的地址和类型从服务器上查询省市县数据
     * @param address URL地址
     * @param type 类型
     */
    private void queryFromServer(String address, String type) {
        showProgressDialog();
        HttpUtil.sendOkHttpRequest(address, new Callback() {
            @Override
            public void onFailure(@NotNull Call call, @NotNull IOException e) {
                getActivity().runOnUiThread(() -> {
                    Toast.makeText(getContext(), "加载失败", Toast.LENGTH_SHORT).show();
                });
            }

            @Override
            public void onResponse(@NotNull Call call, @NotNull Response response) throws IOException {
                String responseText = response.body().string();
                boolean result = false;
                if ("province".equals(type)) {
                    result = Utility.handleProvinceResponse(responseText);
                } else if ("city".equals(type)) {
                    result = Utility.handleCityResponse(responseText, selectedProvince.getId());
                } else if ("county".equals(type)) {
                    result = Utility.handleCountyResponse(responseText, selectedCity.getId());
                }
                if (result) {
                    getActivity().runOnUiThread(() -> {
                        closeProgressDialog();
                        if ("province".equals(type)) {
                            queryProvinces();
                        } else if ("city".equals(type)) {
                            queryCities();
                        } else if ("county".equals(type)) {
                            queryCounties();
                        }
                    });
                }
            }
        });
    }
    /**
     * 关闭进度对话框
     */
    private void closeProgressDialog() {
        if (progressDialog != null) {
            progressDialog.dismiss();
        }
    }

    /**
     * 显示进度对话框
     */
    private void showProgressDialog() {
        if (progressDialog == null) {
            progressDialog = new ProgressDialog(getActivity());
            progressDialog.setMessage("正在加载...");
            progressDialog.setCancelable(false);
        }
        progressDialog.show();
    }
    /**
     * 查询选中省份内的所有市，优先从数据库查询，如果没有查询到再去服务器上查询
     */

}
